A measure of shape compactness is a numerical quantity representing the degree to which a shape is compact. Ways to provide an accurate measure have been given great attention due to its application in a broad range of GIS problems, such as detecting clustering patterns from remote-sensing
images, understanding urban sprawl, and redrawing electoral districts to avoid gerrymandering. In this article, we propose an effective and efficient approach to computing shape compactness based on the moment of inertia (MI), a well-known concept in physics. The mathematical framework and
the computer implementation for both raster and vector models are discussed in detail. In addition to computing compactness for a single shape, we propose a computational method that is capable of calculating the variations in compactness as a shape grows or shrinks, which is a typical application
found in regionalization problems. We conducted a number of experiments that demonstrate the superiority of the MI over the popular isoperimetric quotient approach in terms of (1) computational efficiency; (2) tolerance of positional uncertainty and irregular boundaries; (3) ability to handle
shapes with holes and multiple parts; and (4) applicability and efficacy in districting/zonation/regionalization problems.
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automated zoning procedure;
geographic Information Science;
moment of inertia;
raster data modelling;
vector data modelling
Document Type: Research Article
School of Geographical Sciences and Urban Planning, GeoDa Center for Geospatial Analysis and Computation, Arizona State University, Tempe, AZ, USA
Department of Geography, University of California, Santa Barbara, CA, USA
June 1, 2013
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